Malicious PDF — malware analysis report

Static analysis result for SHA-256 cacf940526fefb9c…

MALICIOUS

PDF

88.4 KB Created: 2021-03-20 07:11:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: aca322e9bb7b491801941fbc830974ad SHA-1: 5a73c8609a31b57f7a10e7f64d79f7a245c89897 SHA-256: cacf940526fefb9c116b58f58fb7dd507e50da7eb8fc085a09bf4a1761ed3a5d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://soxebez.ru/wix?keyword=domain+and+range+of+piecewise+functions+worksheet PDF link annotation
    • http://meriline.store/como_ser_un_latin_lover_gnulaibi8h.pdfIn PDF document text
    • http://nigavereke.mygamesonline.org/how_to_drain_swamp_cooler_line.pdfIn PDF document text
    • http://sebamusimuduj.iblogger.org/determination_of_biological_oxygen_demand.pdfIn PDF document text
    • http://lotibamuzuti.scienceontheweb.net/arrl_handbook_2019.pdfIn PDF document text
    • https://cdn.sqhk.co/zuzipogowita/ijXhjhc/horizon_mobile_village_rv_park.pdfIn PDF document text
    • https://cdn.sqhk.co/kosenopelid/ihnAVS7/menudasubadejojan.pdfIn PDF document text
    • http://feedbacrnz.space/fabalesui0yip.pdfIn PDF document text
    • http://labincom-med.ru/65312346087jvtw5.pdfIn PDF document text
    • http://teplotronic.ru/does_ikea_make_king_bed_framesykdhp.pdfIn PDF document text
    • http://dikegebe.mygamesonline.org/compendio_del_catecismo_de_la_iglesia_catolica_descargar.pdfIn PDF document text
    • http://storeyou.store/un_curso_de_milagros_libro_ejercicios69asg.pdfIn PDF document text
    • https://cdn.sqhk.co/susopavazane/hdhfJhT/drift_warszawa_2019.pdfIn PDF document text
    • https://cdn.sqhk.co/lafuwexale/ihiaWNr/red_ball_hero_adventure.pdfIn PDF document text
    • http://50off.pro/saftirik_greg_in_gnl_full_izleib139.pdfIn PDF document text
    • http://varistop.site/diy_goatee_template3r2pt.pdfIn PDF document text
    • http://fontawesome.iohttp://fontawesome.io/license/In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://528f6e5c-6927-42ef-b7a5-a8f9c349750c.filesusr.com/ugd/07b979_0da859277c924a0c9e52c97c8befce48.pdf?index=trueIn PDF document text
    • http://relufojexoxokaz.epizy.com/37841139938.pdfIn PDF document text
    • http://dudibagigop.rf.gd/little_big_planet_3_trophy_guide_ps4.pdfIn PDF document text
    • https://06e27459-8a58-4d01-a48e-f853eab966f6.filesusr.com/ugd/55f1a0_9337ce866b1a42e8990945dec0323af7.pdf?index=trueIn PDF document text
    • https://f8d82b49-d438-4da2-b906-f876cb6fe635.filesusr.com/ugd/12dc78_6788e5c85ef246f5a9105cc32a50a31c.pdf?index=trueIn PDF document text
    • http://nokolul.epizy.com/10336478769.pdfIn PDF document text
    • http://fetevatakipip.epizy.com/22338805441.pdfIn PDF document text
    • http://jubogaju.atwebpages.com/amazing_grace_chords_in_g.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 6

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d4c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4C1 6784 bytes
SHA-256: a95cffed4bc7a7a4085c2fd81c47296de71db2681cc3ede521ffca8fd72b993d
font_01_sfnt_off0000e5b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5B7 4092 bytes
SHA-256: ffff6a1df756b15fcdbc25732f4dd5592eacee7f05798d96aab3562a88c41366
font_02_sfnt_off0000f54d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF54D 5572 bytes
SHA-256: 90951da4b99f54b8bb8ba5a8d7cd107b9534b8e2e6bf4f547b3fbd074f7bac48
font_03_sfnt_off00010828.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10828 11404 bytes
SHA-256: 487e49296938c815f5c8fad4adc050e9d34ef2ae616fdfcee964fe15fc26290d
font_04_sfnt_off00012e8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E8E 16344 bytes
SHA-256: bd706e12874c942ab99088ff0040eade8b805b493e9d0493b689923f1ffcf1d5
font_05_sfnt_off00014474.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14474 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3